well 7777,
it could be that yale no longer has that information available or are not willing to find it.
i'm sure they would like to see these old antiques gone and force consumers to buy newer lifts instead of fixing the old ones ;o)

know what i mean?

hopefully someone has held on to some old hardback manuals and comes up and helps you out... if yale isnt willing to i dont know where else you are going to find this information.

oh and as far as that missing digit? generally if its 1 digit short just add a 0 to the beginning of the number. Thats how we did it years ago when i worked for yale. Not sure why they leave it off.

good luck